Beijing, China (SportsNetwork.com) -
Reigning champion Serena Williams, second seed Simona Halep and former finalist Maria Sharapova were among Tuesday's second-round winners at the $5.4 million China Open.
The world No. 1 great and two-time China Open champ Williams subdued Bulgarian Tsvetana Pironkova 6-2, 6-3 on the hardcourts at Beijing Olympic Green Tennis Center.
Williams, who won her 18th Grand Slam singles title in New York earlier this month, beat Jelena Jankovic for last year's Beijing title and also captured this Chinese event back in 2004.
Her third-round opponent will be Czech Lucie Safarova.